Prince Harry attends Invictus Games event 2 miles away from the royal family's garden party 

Looks like cancer has not thawed the cold relations between Prince Harry and the British royal family yet. Harry celebrated the 10th anniversary of the Invictus Games at an event in London on Wednesday (May 8) but the royal family was not in attendance.

The Duke of Sussex marked the tournament's milestone during a service of thanksgiving held at StPaul's Cathedral, the church where his parents, King Charles III and the late Princess Diana, married in 1981.

In 2014, Harry founded the Invictus Games, a multi-sport event for wounded, injured and sick servicemen and women.

The first Invictus Games were held in September 2014 at London's Queen Elizabeth Olympic Park. Since then Harry has been an active participant of the annual event.

Meanwhile, Charles and senior royal family members attended a garden party at Buckingham Palace just two miles away. Earlier it was announced that the monarch would not be able to meet with his son while Harry is in the UK.

At Buckingham's first garden party of the season, Charles was joined by Queen Camilla; Anne, Princess Royal; Prince Edward, Duke of Edinburgh; Sophie, Duchess of Edinburgh; Birgitte, Duchess of Gloucester; and Prince Richard, Duke of Gloucester. Ahead of the garden party, Charles met the UK Prime Minister Rishi Sunak.

Charles' son Prince William and his wife Kate Middleton did not attend the garden party. The Prince of Wales conducted an investiture ceremony at Windsor earlier on Wednesday while his wife is taking time off from official royal duties while she undergoes cancer treatment.

Harry and William's uncle, Charles Spencer, younger brother of Diana, attended the Invictus Games' anniversary service to support his nephew.

The Duke of Sussex will attend multiple events while in London to commemorate the Invictus Games' 10th anniversary.

He is expected to stay in UK for three days before his wife Meghan Markle joins him for a trip to Nigeria. The couple have been invited to visit the African country by its Chief of Defence Staff.